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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 257 |
| 3 | 1772 |
| 4 | 123729 |
| 5 | 853956 |
| 6 | 59636977 |
| 7 | 411604876 |
| 8 | 28744899041 |
| 9 | 198392696132 |
| 10 | 13854981700641 |
| 11 | 95624867930604 |
| 12 | 6678072434809777 |
| 13 | 46090987949854852 |
| 14 | 3218817058596611729 |
| 15 | 22215760566962107916 |
| 16 | 1551463144171132043457 |
| 17 | 10707950502287786160516 |
[4,257,1772,123729,853956,59636977,411604876, 28744899041,198392696132,13854981700641, 95624867930604,6678072434809777,46090987949854852, 3218817058596611729,22215760566962107916, 1551463144171132043457,10707950502287786160516] |